V

OUT

REF

IN

I

COMP2

R

S

I

COMP1

Compensation

Patents Pending

Diff

Amp

Timing, Error Detection,

and Power Control

Degauss

V

REF

V

REF

GND

+5 V

IS2

IS1

DRV401-Q1

I

P

Compensation Winding

Magnetic Core

Primary Winding

Field Probe

PWM

PWM

H-Bridge

Driver

Probe

Interface

Integrator

Filter

Copyright © 2016, Texas Instruments Incorporated

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

DRV401-Q1

SBOS814 – DECEMBER 2016

DRV401-Q1 Sensor Signal Conditioning Device

for Closed-Loop Magnetic Current Sensor

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC-Q100 Qualified With the Following Results:

–

Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

Range

–

Device HBM ESD Classification Level 1C

–

Device CDM ESD Classification Level C6

•

Single-Supply: 5-V

•

Power Output: H-Bridge

•

Designed for Driving Inductive Loads

•

Excellent DC Precision

•

Wide System Bandwidth

•

High-Resolution, Low-Temperature Drift

•

Built-In Degauss System

•

Extensive Fault Detection

•

External High-Power Driver Option

•

Compact Footprint

2 Applications

•

Automotive

•

Motor Control in Automotive Applications

•

Flux Gate Current Sensing

•

Generator and Alternator Monitoring and Control

•

Frequency and Voltage Inverters

•

Motor Drive Controllers

•

System Power Consumption

•

Photovoltaic Systems

3 Description

The

DRV401-Q1

device

is

fully

qualified

for

automotive applications and is suitable for motor

control drive and battery monitoring systems.

When used with a magnetic sensor, the DRV401-Q1

monitors ac and dc currents to high accuracy.

Provided functions include: probe excitation, signal

conditioning of the probe signal, signal loop amplifier,

an H-bridge driver for the compensation coil, and an

analog signal output stage that provides an output

voltage proportional to the primary current. It offers

overload and fault detection, as well as transient

noise suppression.

The

DRV401-Q1

device

directly

drives

the

compensation coil or connects to external power

drivers. Therefore, the DRV401-Q1 combines with

sensors to measure small to large currents.

To maintain the highest accuracy, the DRV401-Q1

demagnetizes (degausses) the sensor at power-up

and on demand.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

DRV401-Q1

VQFN-20

5.00 mm × 5.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Closed-Loop Magnetic Sensing